Amazon Software Development Engineer SDE interview questions

A night before the interview, our college arranged an online interactive session for us with one of the Amazon employees. There I learnt the interview is usually difficult to crack and with the ongoing pandemic, it's going to be more difficult because Amazon tends to use their own app for the video calling where most of the times(presumably), the recruiter's face is not visible which(I feel) creates a more tense environment for the candidate. Even though the question asked by the interviewer was easy and I had solved that problem earlier, I couldn't answer it properly just out of nervousness. I was ousted in that very round but I learnt you can't crack the interviews of big corporations like Amazon and Goldman Sachs just by studying a night before the interview. I am quite good at aptitude and usually clear the first cognitive round and sometimes, the technical rounds too but for cracking a technical round, you need hell lot of preparation(at least a year) and most importantly loads of diligence and persistence.